|The date stamping on a 65-66 Mustang Rear Bumper is located on the inside where the rear license plate light is mounted. It is more difficult to see than the front bumper date stamping. This particular example shows a date stamping of "6 1 M4."
This is June 1, 1964.
Last month, I made a post about the date stampings on 65-66 Mustang front bumpers. I received several questions about whether or not the rear bumpers had date stampings also. Well, they do, but the stampings are just a bit more difficult to read due to their location.
The rear bumper is stamped with a date on the inside where the rear license plate light is located. It is stamped from the inside. Take a look at the example from our 64 1/2 HiPo Mustang Coupe.